What an absolutely fantastic post!!! Every time I would try to close FCPX, it would say “canceling background tasks” close the window, but the app would show in the dock with an arrow under it still and the status was “application not responding”. I would have to force quit it but I would have the same problem next time. Also, some of the projects and media would not show the picture in the frame, just a solid frame. I followed your tip in the original post and it is now performing flawlessly. Thanks so much!!!